Math: Continuing 2-Digit Addition and Subtraction Strategies

Suggested Time Frame: 20 Instructional Days

Focus TEKS

2.4B add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations

2.2A use concrete and pictorial models to compose and decompose numbers up to 1,200 [100 in this unit] in more than one way as a sum of so many thousands, hundreds, tens, and ones

2.2E locate the position of a given whole number on an open number line

2.2F name the whole number that corresponds to a specific point on a number line

2.4A recall basic facts to add and subtract within 20 with automaticity

2.7B use an understanding of place value to determine the number that is 10 or 100 more or less than a given number up to 1,200 [100 in this unit]

2.9C represent whole numbers as distances from any given location on a number line

Problem Solving

2.4C solve one-step and multi-step word problems involving addition and subtraction within 1,000 [100 in this unit] using a variety of strategies based on place value, including algorithms

2.4D generate and solve problem situations for a given mathematical number sentence involving addition and subtraction of whole numbers within 1,000 [100 in this unit]

Representing

2.7C represent and solve addition and subtraction word problems where unknowns may be any one of the terms in the problem

Computational Fluency TEKS

Subtraction Fact Strategies

2.4A recall basic facts to add and subtract within 20 with automaticity [Use Doubles and Make Ten strategies in this unit]

1st Grade Skip Counting

1.5B skip count by twos, fives, and tens to determine the total number of objects up to 120 in a set; [starting at 0 and from other numbers]

Spiral Review TEKS

Measure Time

2.9G read and write time to the nearest one-minute increment using analog and digital clocks and distinguish between a.m. and p.m.

1st Grade Geometry Concepts

1.6AClassify and sort regular and irregular two-dimensional shapes based on attributes using informal geometric language

1.6B Distinguish between attributes that define a two-dimensional or three-dimensional figure and attributes that do not define the shape

1.6C Create two-dimensional figures, including circles, triangles, rectangles, and squares as special rectangles, rhombuses, and hexagons

1.6D Identify two-dimensional shapes, including circles, triangles, rectangles, and squares as special rectangles, rhombuses, and hexagons, and describe their attributes using formal geometric language